Perhaps you should try some spelling variations:
peter brian » peter bryant, leiter brian, peter brown
peter gray » peter graf, peter ray, peter grant
peter bray » peter brady, peter ray, peter bratt
peter rae » peter r

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((peter gray) OR (((((peter bray) OR (peter brian))) OR (peter rae)))) (bioengineer).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((peter gray) or (((((peter bray) OR (peter brian))) or (peter rae)))) (bioengineer)".
• Adding a wildcard symbol may retrieve word variants: ((peter gray) or (((((peter bray) OR (peter brian))) or (peter rae)))) (bioengineer)*.